<template>
<div id="root">
  <div class="todo-container">
    <div class="todo-wrap">
     <MyHeader @addTodo="addTodo" />
     <MyList :todos="todos"/>
     <MyFooter :todos="todos" @checkAllTodo="checkAllTodo" @clearAllTodo="clearAllTodo"/>
    </div>
  </div>
</div>

</template>

<script>
import pubsub from 'pubsub-js';
import MyHeader from "./components/MyHeader.vue";
import MyList from "./components/MyList.vue";
import MyFooter from "./components/MyFooter.vue";
export default {
  name: "App",
  components:  {MyHeader,MyList,MyFooter},
     data() {
     return {
       todos:JSON.parse(localStorage.getItem('todos_key')) || []
     }
   },
   methods: {
     addTodo(todoObj){
          this.todos.unshift(todoObj)
     },
     checkTodo(id){
        this.todos.forEach((todo)=>{
           if(todo.id === id) todo.done = !todo.done
        })
     },
      updateTodo(id,title){
        this.todos.forEach((todo)=>{
           if(todo.id === id) todo.title = title
        })
     },
     deleteTodo(_,id){
       this.todos = this.todos.filter((todo)=>{
         return todo.id !== id
       })
     },
     checkAllTodo(done){
       this.todos.forEach((todo)=> {
         todo.done = done
       })
     },
     clearAllTodo(){
       this.todos = this.todos.filter((todo)=>{
          return !todo.done
       })
     }
   },
   watch:{
     todos:{
       deep:true,
        handler(value){
          localStorage.setItem('todos_key',JSON.stringify(value))
        }
     }
   },
   mounted() {
     //事件全局总线
     this.$bus.$on('checkTodo',this.checkTodo)
     this.$bus.$on('updateTodo',this.updateTodo)
     this.$bus.$on('deleteTodo',this.deleteTodo)
     //消息的订阅和发布
     //this.pubId = pubsub.subscribe('deleteTodo',this.deleteTodo)
   },
   beforeDestroy() {
     //事件全局总线
     this.$bus.$off('checkTodo')
     this.$bus.$off('updateTodo')
     this.$bus.$off('deleteTodo')
     //消息的订阅和发布
     //pubsub.unsubscribe(this.pubId)
   },
};
</script>

<style>
/*base*/
body {
  background: #fff;
}

.btn {
  display: inline-block;
  padding: 4px 12px;
  margin-bottom: 0;
  font-size: 14px;
  line-height: 20px;
  text-align: center;
  vertical-align: middle;
  cursor: pointer;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.2), 0 1px 2px rgba(0, 0, 0, 0.05);
  border-radius: 4px;
}

.btn-danger {
  color: #fff;
  background-color: #da4f49;
  border: 1px solid #bd362f;
}
.btn-edit {
  color: #fff;
  background-color: skyblue;
  border: 1px solid rgb(73, 154, 185);
  margin-right: 5px;
}
.btn-danger:hover {
  color: #fff;
  background-color: #bd362f;
}

.btn:focus {
  outline: none;
}

.todo-container {
  width: 600px;
  margin: 0 auto;
}
.todo-container .todo-wrap {
  padding: 10px;
  border: 1px solid #ddd;
  border-radius: 5px;
}

</style>